I feel the steering stem nut loses torque the more miles you put on it. This can depend on air pressure, road conditions and how hard you ride. A worn tire amplifies the situation. You can go to All Balls which causes more friction and less wobble but now many are complaining they are notching. The OEM bearings work fine but they need occasional maintenance such as regreasing and retorquing. Many have found very little grease on the bearing from the factory. If your torque is too loose you will have a wobble, if it's to tight you will have a high speed weave. There's a fine line between the two.